He bases that claim on the number of chondritic meteorites that have clearly been magnetised.
BBC: A fleeting encounter with an 'inbetweener'
Although widely acknowledged to be ubiquitous in chondritic meteorites, their formation has been a mystery since 1877.
FORBES: Planets Made Easy: The Cosmic Glue That Binds Us All
The spacecraft's data indicates the asteroid has a very primitive surface - rather like the chondritic meteorites that are sometimes picked up on Earth and which are assumed to have come from bodies that experienced no melting or differentiation.
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